I thought I was in meetings today. Show up at work and discover I'm doing low speed performance work-ups in the 412. It was done just for technique so the data gathering was far from rigorous, but I saw the numbers you mentioned.
We flew cardinals and subcardinals at 10 and 20 knots relative wind. Unfortunately, I thought the FTE was recording perf...he wasn't. So I only had the green and red 135° and the 180° data, at 20 knots. With those three data points the effect was seen, about 7% less mast torque at the green 135° than at the red 135.